Boring bar and the like



- @Sheets-Sheet l rZz vez? ws' A. E. VOSBURG ET AL BORING. BAR AND THE LIKE Filed F'eb. e, 1922 NT f l L.. Q

April 8 1924.

N5 QMJMMJ AN 2 Sheets-Sheet 2 A. E. VOSBURG ET AL BORING BAR AND THE LIKE Filed Feb. 6, 1922 April 8 1924.

Patented Si, i924@ ALAN E. VOSBURG AND ROBERT B. WHTHE-I, GF DETROT, MICHIGAN, ASSIGNORS TO ARTHUR V. HANNFN, QF CHECLGO, LLNOS.

BORING BAR AND 'EI-1E LIKE.

Application filed February 6, 1922. Serial No. 534,623.

To all whom t may `concern Be it known that we, ALAN E. Vosnnno and ROBERT B. llifnrrwnr. both citizens of the United States, residing at Detroit, in the county of lavne and State of Michi-V gan have invented certain new and useful improvements in Boring Bars and the like7 of which the following is a specification.

rIhis invention relates tc certain improvements in boring bars and the like. The invention has reference particularlf,r to improvements in. the ineansfor holding and locking the cutting tools within the boring har` as well as the means for adjusting the tools to the desired gauge or cutting diameter. y

More particularly the invention has to do with an improved construction of locking device whereby the tools are rigidly locked with respect to` the boring bar after being` set to the desired gauge. Still incre particularly, thc invention has to do with an improved locking device of very simple construction., and which can be very cheaply manufactured, but which may be very accurately made and which will be capable of exerting a very powerful. lockingr action in order to securely hold the tools in position.

Still more particularly another object of the invention isto provide a boring bar and improved lockingA block therefor which may be interchangeably used with tools extend-- ing radially with respect to the boring bar.` or tools slanting with respect to the airis-of the boring bar and lying an angle with respect to ea ch other.

Still another object of the invention is to combine with such locking device and with the tools, an improved tool adjusting element for initially adjusting the gauge or cutting diameter of the tools with respect to each other and before they are locked solidly in the boring bar. Y

Other objects 'and uses of the invention will appear from a detailed description of the same, which consists in the features of construction and combinations of parts hereinafter described and claimed.

In the drawings:

Figure 1 shows a fragmentary face view of boring bar having applied thereto 'a locking block embodying the features of the present invention, the same being shown in association with a pair of angular cutting tools; V

Fig'. 2 shows a view corresponding to Fig. 1. with the exception that the central portion of the boring bar is shown in section and one corner of the locking block is cut away to more 'clearly illustrate the construction of the locking block itself;

Fig. 3 shows a cross section taken on the line 3-3 of 1, looking in the direction of the arrows;

1l shows a cross section taken on the line 4% of 2, looking in the direction of the. arrows;

Fig. 5 shows a view similar to that of Fig. 1. with the exception that the posit-ionv of the locling block has been reversed and straigl'it cutting tools have been substituted in place of the angular cutting tools illustrat-ed in the earlier figures;

6 shows a view at right angles to that or 5;

shows a detail face view of the lockoolr, the set scii'ews being removed;

8 shows an edge view corresponding g. 7 and Y shows a bottom face view of the adg -scroll plate. Thehoringg har itself is designated by the numeral 1() in the di'lierent figures. ltris provided with a transverse slot 11A one edge 12 lying at right angles to the anis of rotationl of the boring har, and having its front end wall in the form of a pair of angular faces 13 and 14e. vThe faces 13 and 14 lie at equal angles with. respect to the axis of rotation. and in the construction illustrated, they slant outwardly away frointhe other wall 12 of the slot 11 so that the extreme outside portions of the slot are longer than its central portion.

1Within the slot there are accomodated the cutting` tools 15 and16 and the locking block 17. rEhe locking block has a straight face on one side together with a pair of angular faces 18 and 19 on its other side. The faces 18and 19 are formed at equal angles with respect to the axis of rotation, and furthermore, said faces subtend between them the same ang-le as is subtended by the faces 13 and 14 of the slot 12; Consequently, the

i? s raight tools of the forni faces i8 and 19 of the locking;` bl el; i7 lie the groove et the scroll plate when the tools o parallel to the faces .i3 and ll: rosprctivelj.' of the slot when the lockingblock i un solid against the end l2 o'f the slot The tools l5 and i6 have pare-.ll l and are c the ond ol the slot ll. are set into the angular eno'. ot (ne slot ll, shown in Figs. l ar 2., the locking block il preferred tools be oppositelv recessed. as shovvn at in Figs. i and Q. so that Lhe toolo may be inade longer and nifty have their inner ends overlapped as clearly illustrated in Fig. 3. fr siniilar overlapping may he.nsed When oi. Figs. 5 and G are substituted.

ln order to adjust the anionnt oif projection of the tools with respect to the boringv ber anyv suitable adjusting` device inav be provided. The arrangement illrstrated in the dfgaivingr is a. very convenient and satis factory one for this purpose. Said arrangeinent includes a circular scroll plate 2l set into recess 29 in the .tace of the slot ll, as sliov-fn in l A; il and l. The bottoni 'lia/co of said scroll plie is provided with a spiral groove which engages with teeth 2li and on the in nr portions ot tic tivo tools. Upon rotation oi" the scroll 4plate inthe recess 22, the tools will be moved towards or ifroin each other so as to correspon iglv adjust the ainount oit projection. vthis rotation ot the scroll plate may be etlected in any convenient n inner. as 'tor example, b v the use oi a hexagonal lic-v inserted `into a socket QG in the l'ace ot the scroll plato. ln such case a passage 27 is prm'fided in the boringr ha r to give access to said socket 26.

The. tir-.ce et the scroll plate niav be provided with a series inarls or graduations QS which serve to indicate graduated amounts o'l inoveinent ot the tools by rotalion of the scroll plate.

The arrangement illustrated is such that tl cllpla*I t vithin a veess 22 .vhosc position is fired with respect to the transverse slot 11 oi the horing bar. Vl"nrther more, the position ot the scr ll plate Within aid recess is snch that its spiralig'roove Will properlv niesh with the teeth 2land 25 ot the tools 15 and 1G when into position against the anguar Walls 13 and` 14, shov'n in Figs. l and 2. Bv proper proportion of the parts, it is ossible to secure proper inesh of the teeth ofthe tools with are set against the hach straight face ol` the slot ll in the position shown in Figs.

and 6.

rlhe locking plate l? is shown in detail in Figs. l and S. and also very vell illus- O lt is trated in ll. n. irovided with a pair of in verdi;v extending slots 29 and i-.vlncli provide the Wings 3l and 32 which are joined to the body oit the locking plate b v ineens of' the central tongue 83. The locling` prato is also provided with inwardly e5;- tending threaded sockets Jfor the acconnnoda tion ot set screws 84- and 35. which may be threaded in or out with respect to the locking plete, beingeasiljv accessible troni the outside ol the boring bar, as Will be readilyY appreciated from examination ot Figs. 2 and 6 in particular. The thresdef. sockets ot the loc-hing' plate. or the screvvs Sil and 35. or both. er tapered in such manner that bfi rotating' the screws a powerful ivedg'ing notion is exerted which tends to snread the Wings 3l and 82 ot the locking plate. and thus bring' about av powerful looking' eifect. in this Wav the tools are locked very ecnrelv in place. lhntherinore,y this .vcdging action will be secured no inatte1 in which position the locking plate is set, `whether that of Figs. l and 2 or that of ins. and 6.

lllhen the tools are being adjusted or changed. it is desirable to hold the locking plate in position Within the slot, vvith at least snflicient torce to prevent its unintentional removal. YWe have, therefore, provided pair of relatively shallow sockets 36 and 3l in one tace of the slot l?. and have also provided spring pressed balls 38 and 3i) the lockine; plate itself. which are adapted to enter the sockets 36 end 3l' under spring pressure. bells are seated within the transverse pessages 40 and il of the locking lote, the springs -i-Q and L3 pressing against .ic balls and heine` held in place by the stud ycrews -ll an #i5 resiectivelv. The opposite ends of the holes il() and ll are slightly,v reduced in size, so that the bells ivill not be fully. projected when the locking plate is Withdrawn troni the slot 1l.

llilliile vve have herein shown and de .cribed onli,7 certain embodiments ot the ifeatures of our present invention, still We do not liinit o rselves to the saine except as We nav do so in the claims.

*We clsini:

i hese l. it. boring; har comprising in combina-A Curl Lacasse within said slot and against one cnd wall and projecting beyond the sides of the shaft, means for simultaneously moving said tools towards and from each other to thereby adjust the cutting diameter, means for indicating the amount of such adjustment, and means for locking the tools rigid with respect to the shaft comprising a locking block of a thickness to enter into the slot and having one of its end walls straight and its other end wall V- shapeo with the angle between the arms of the l! equal to the :ingle between the arms of the Vshaped end wall of the slot, the axial length of said locking plate being at eachpoint equal to the difference between the axial length of the slot and of the cutting tool at such point, there being a pair of inwardly extending slots in the locking plate establishing a pair of fins centrally joined to the body of the locking plate, and mea-ns for expanding said slots to deliect the fins and lock the tools rigidly within the slot, substantially as described.

2. A boring bar comprising in combination a shaft having transverse through slot, one end wall of which is straight and lies atright angles to the direction of rotation of the shaft and the other end wall of which is V-shaped with the two arms of the V lying at equal angles with respect to the axis of rotation, a pair of cutting tools within said slot and against one und wall and projecting beyond the sides of the shaf i, means for moving said tools with respect to each other to thereby adjust their cutting positions, and means for locking the tools rigid with respect to the shaft comprising a locking block of a thickness to enter into the slot and having one of its end walls straight and the other end wall li-shaped with the angle between the arms of the J equal to the angle between the arms of the al-shaped end wall of the slot, thc axial length of said lookin@` plate being at each point equal to the dierence between the axial length of the slotand of the cut-ting tool at such point, there being a pair of inwardly extending slots in the locking plate establishing a pair of fins centrally joined to the body of the locking plate, and means for expanding said slots to deflect the hns and loclr the tools rigidly within the slot, substantially as described.

3. A boring bar comprising in combination a shaft having a transverse through slot, one end wall of which. is straight and lies at right angles to the direction of rotation of the shaft and the other end wall of which is lf-shaped, a pair of cutting tools within said slot and against one end wall and projecting beyond the sides of the shaft, means for moving said tools with respect to each other to thereby adjust their cutting positions, and means for locking the tools rigid with respect to the shaft comprising a locking block of a thickness to enter into the slot and having one of its end walls straight and its other ond wall --shaped, the axial length of said. locking plate being at each point equal to the di iference between the axial length ofthe slot and of the cutting tool at such point, there being a pair of inwardly extending slots in the locking plate establishing a pair of fins centrally joined to the body of the locking platay and means for expanding said slots to deflect the fins and lock the tools rigidly within the slot, substantially as described.

il. A boring bar comprising in combination a shaft having a transverse slot, one end wall of which is straight and lies at right angles to the direction of rotation of the shaft and the other end wall of which lies at an angle with respect to the first mentioned end wall, a pair of cutting tools within said slot and against one end wall and projecting be'- yond the sides of the shaft, and means for locking the tools rigid with respect to the shaft comprising a locking block of a thickness to enter into the slot and having one of its end walls straight and its other end Wall lying at an angle to its rst mentioned end wall, the axial length of the locking plate being at each point equal to the difference betwe n the axial length of the slot and of the cutting tool at such point, there being a pair of in fardly extending slots in the locking plate establishing a pair of fins centrally joined to the body of the locking plate, and means for expanding said slots to deflect the fins and lock the tools rigidly within the slot, substantially as described.

5. A. boring bar comprising in combination a shaft having a transverse through slot, a cutting tool within said slot and against one end wall thereof and projecting beyond the side of the shaft, and means for locking said tool rigid with respect to the shaft comprising a locking block of a thickness to enter into the slot and having one of its end walls adapted to seat Y evenly against the other end wall of the slot, the axial length of said locking plate being at each point equal to the difference between the axial length of the slot and of the cutting tool at such point, there being an inwardly extending slot in the locking plate establishing a iin joinedat one end to the body of the locking plate, and means for expanding said slot to deflect the hn and lock the tool rigidly within the slot, substantially as described.

6. As a new article of manufacture a locking block for the purpose specified comprising a steel block of desired thickness having one of its end walls straight and its opposite end wall V-Shaped, there being a pair of inwardly extending slots in said pla-te adjacent to the first mentioned end wall establishing a pair of fins centrally joined to the locking plate, and means for expanding said slots to deflect the fins, substantially as described. K

7. As a new article of manufacture a 1oek ing block comprising a plate having one of its end Walls straight and its Opposite end Wall formed at an angle With respect thereto, there being a pair of inwardly extending slots adjacent te one of the end Walls establishing a pair of fins centrally joined to the body of the locking plate7 and means for eX- panding said slots to deflect the ns 'for locking purposes, substantially as described.

ALAN E. VUSBURG. ROBERT B. WHITNEY. 

